<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./lib/vue.min-2.6.11.js"></script>
</head>

<body>
    <div id="app">
        <input type="button" value="浪起来" v-on:click="lang">
        <input type="button" value="别浪" v-on:click="stop">
        <h3 v-text="msg"></h3>
    </div>

    <script>
        const vm = new Vue({
            el: '#app',
            data: {
                msg: '猥琐发育，别浪~~~~~~~',
                intervalID: null
            },
            methods: {
                lang: function () {
                    if (this.intervalID != null) return
                    const that = this
                    this.intervalID = setInterval(function () {
                        const start = that.msg.substring(0, 1)
                        const end = that.msg.substring(1)
                        that.msg = end + start
                    }, 400)
                },
                stop: function () {
                    clearInterval(this.intervalID)
                    this.intervalID = null
                }
            }
        })
    </script>
</body>

</html>